NaokiAritomi - 00:33, Thursday 13 February 2020 (2034)
Loss and phase noise measurement with single bounce from filter cavity
[Aritomi, Yuhang]
We locked FC with green and implemented dithering to be sure that alignment of FC is good. We locked IR off resonance (detuning is 1kHz). Unfortunately, today there was a large mode mismatch peak in AMC, which was ~50mV out of 1V. This becomes ~10% readout loss.
| MZ offset | green power (mW) | OPO temperature | p pol PLL (MHz) | CC2 demod phase (SQZ) (deg) | CC2 demod phase (ASQZ) (deg) |
| 4.2 | 17.4 | 7.163 | 190 | 185 | 260 |
| 4.3 | 21.2 | 7.175 | 200 | 185 | 260 |
| 4.4 | 25 | 7.175 | 200 | 195 | 255 |
| 4.6 | 32.6 | 7.2 | 215 | 200 | 255 |
| 4.8 | 39 | 7.2 | 200 | 195 | 250 |
| 5.2 | 50.5 | 7.22 | 200 | 200 | 250 |
| 4.8 (without OD 0.2) | 57 | 7.22 | 180 | 195 | 240 |
Measured loss is 40(1) % and phase noise is 30(5) mrad.
Images attached to this report
